Nanoprinting 3D using semiconductor quantum dots to create optoelectrical materials

https://phys.org/news/2022-09-3d-nanoprinting-semiconductor-quantum-dots.html

"semiconductor quantum dots (nanocrystals made of cadmium selenide, covered with zinc sulfide and with caps 3-mercaptopropionic acid ligands)... activated using laser. Photons from laser absorbed by nanocrystal, resulting in... bonding between the quantum dots—a process known as two-photon absorption. In their setup, absorption of the protons was only possible in places where the light intensity was at its highest. This allowed for creating bonds smaller than the wavelength of the light"